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SubjectRe: Oops while modprobing phy fixed module
Gabriel C wrote:
> Gabriel C wrote:
>
>> Tejun Heo wrote:
>>
>>
>>> Satyam Sharma wrote:
>>>
>>>
>>>
>>>> On 7/16/07, Gabriel C <nix.or.die@googlemail.com> wrote:
>>>>
>>>>
>>>>
>>>>> Here the bisect result:
>>>>>
>>>>> 3007e997de91ec59af39a3f9c91595b31ae6e08b is first bad commit
>>>>> commit 3007e997de91ec59af39a3f9c91595b31ae6e08b
>>>>> Author: Tejun Heo <htejun@gmail.com>
>>>>> Date: Thu Jun 14 04:27:23 2007 +0900
>>>>>
>>>>> sysfs: use sysfs_mutex to protect the sysfs_dirent tree
>>>>>
>>>>>
>>>>>
>>> Hmmm... Weird. The patch is supposed to make synchronization more
>>> strict not less unless I've forgotten locking at some place. Gabriel,
>>> can you please choose SLAB and enable CONFIG_DEBUG_SLAB and
>>> DEBUG_SLAB_LEAK and see whether kernel complains about something?
>>>
>>>
>>>
>> Sure , give me some minutes.
>>
>>
>
> With DEBUG_SLAB_LEAK set ( and a lot other DEBUG options ) I get on
> current HEAD
> ( abce891a10559343d8ac9f79b46d78afdba63a40 ) an Oops too now , just the
> box isn't died.
>
> Config and dmesg can be found there :
>
> http://194.231.229.228/2.6.22-gabce891a/
>
> Here it is :
>
> [ 199.766878] Fixed PHY: Registered new driver
> [ 199.768069] BUG: unable to handle kernel paging request at virtual address 6b6b6b87
> [ 199.768081] printing eip:
> [ 199.768085] c01a0796
> [ 199.768089] *pde = 00000000
> [ 199.768098] Oops: 0000 [#1]
> [ 199.768102] PREEMPT SMP DEBUG_PAGEALLOC
> [ 199.768111] Modules linked in: fixed pc87360 hwmon_vid i2c_isa eeprom adm1021 uhci_hcd sr_mod shpchp pci_hotplug ohci_hcd iTCO_wdt iTCO_vendor_support intel_agp i82860_edac i2c_i801 ehci_hcd usbcore edac_mc cdrom agpgart 3c59x mii ext4dev jbd2 capability commoncap loop lp parport_pc parport
> [ 199.768182] CPU: 1
> [ 199.768184] EIP: 0060:[<c01a0796>] Not tainted VLI
> [ 199.768188] EFLAGS: 00210202 (2.6.22-gabce891a #27)
> [ 199.768205] EIP is at __sysfs_remove_dir+0x20/0x64
> [ 199.768213] eax: 00000000 ebx: de583e04 ecx: e5113728 edx: 6b6b6b6b
> [ 199.768222] esi: e5113738 edi: e5113728 ebp: de583e20 esp: de583e04
> [ 199.768230] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
> [ 199.768238] Process modprobe (pid: 2067, ti=de582000 task=d79174c0 task.ti=de582000)
> [ 199.768246] Stack: e5113728 00000000 00000000 00000000 d96bcce0 e5113728 00000000 de583e30
> [ 199.768271] c01a0810 d96bcce0 d96bcbf8 de583e3c c01db3eb d96bcce0 de583e50 c023e338
> [ 199.768298] d96bcbf8 d96bcbf8 e0b3eef0 de583e5c c023e365 d96bcbf0 de583e9c e8c472e8
> [ 199.768327] Call Trace:
> [ 199.768333] [<c0104f86>] show_trace_log_lvl+0x1a/0x2f
> [ 199.768348] [<c0105036>] show_stack_log_lvl+0x9b/0xa3
> [ 199.768359] [<c010520c>] show_registers+0x1ce/0x2de
> [ 199.768370] [<c010543b>] die+0x11f/0x1f8
> [ 199.768380] [<c01137a9>] do_page_fault+0x438/0x507
> [ 199.768392] [<c031893a>] error_code+0x72/0x78
> [ 199.768405] [<c01a0810>] sysfs_remove_dir+0x2c/0x30
> [ 199.768415] [<c01db3eb>] kobject_del+0xf/0x19
> [ 199.768429] [<c023e338>] device_del+0x228/0x24a
> [ 199.768442] [<c023e365>] device_unregister+0xb/0x15
> [ 199.768452] [<e8c472e8>] fixed_mdio_register_device+0x1dc/0x208 [fixed]
> [ 199.768467] [<e8c4a01e>] fixed_init+0x1e/0x33 [fixed]
> [ 199.768479] [<c013d290>] sys_init_module+0x1589/0x1677
> [ 199.768493] [<c0103f16>] sysenter_past_esp+0x5f/0x99
> [ 199.768503] =======================
> [ 199.768508] Code: e7 fd ff ff 83 c4 10 5b 5e 5d c3 55 89 e5 57 56 53 83 ec 10 89 c7 85 c0 74 4d 8d 5d e4 89 c2 89 d8 e8 1f fb ff ff 8d 77 10 eb 27 <8b> 42 1c 25 ff 00 00 00 74 1a 83 f8 02 74 15 8b 42 0c 89 06 c7
> [ 199.768675] EIP: [<c01a0796>] __sysfs_remove_dir+0x20/0x64 SS:ESP 0068:de583e04
>
>
>
>

Damn I forgot to paste the gdb output =)


(gdb) l *__sysfs_remove_dir+0x20
0xc01a0796 is in __sysfs_remove_dir (fs/sysfs/dir.c:855).
850 sysfs_addrm_start(&acxt, dir_sd);
851 pos = &dir_sd->s_children;
852 while (*pos) {
853 struct sysfs_dirent *sd = *pos;
854
855 if (sysfs_type(sd) && sysfs_type(sd) != SYSFS_DIR) {
856 *pos = sd->s_sibling;
857 sd->s_sibling = NULL;
858 sysfs_remove_one(&acxt, sd);
859 } else

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